Re: Cisco access list - multihomed question

[Brian Longwe <blongwe at psg.com>]

Asante sana <thank you> ...I will test it out right away...


On Sun, 28 Oct 2001 09:56:30 -0800
"Barry Raveendran Greene" <bgreene at cisco.com> wrote:

> 
> It should work with out CEF (original optimum/flow based PBR code). It will
> just be faster with the CEF code.
> 
> > -----Original Message-----
> > From: owner-afnog at uol.co.ug [mailto:owner-afnog at uol.co.ug]On Behalf Of
> > Brian Longwe
> > Sent: Sunday, October 28, 2001 9:10 AM
> > To: Barry Raveendran Greene
> > Cc: afnog at afnog.org
> > Subject: Re: Cisco access list - multihomed question
> >
> >
> > Thanks for the response Barry....
> >
> > Is it only implementable(sic) in CEF? I am not using CEF at the
> > moment because when I enable it, the router seem to go into too
> > many cpu cycles and my wccp sessions drop, killing browsing for
> > my customers....
> >
> > Thanks,
> >
> > Brian
> >
> > On Sun, 28 Oct 2001 08:04:17 -0800
> > "Barry Raveendran Greene" <bgreene at cisco.com> wrote:
> >
> > > Hello Brian,
> > >
> > > Rephrasing - you want packets with a source address x.y.z.0/25
> > to bypass the
> > > forward table (FIB) and be forwarded in a direction of you choice.
> > >
> > > So what you are looking for is a "FIB bypass" feature. On the
> > Cisco (where
> > > is was first created) it is called Policy Based Routing (PBR).
> > >
> > > There is a lab on PBR in the ISP Workshop materials
> > > (http://www.cisco.com/public/cons/workshops/) and found via key word
> > > searching on Cisco's web site. Note that in the middle of 12.0
> > we made PBR a
> > > CEF feature - allowing it to handle more PPS and not be process
> > switched. So
> > > check the documentation for any specific details.
> > >
> > > Also note that this will only take care of traffic being
> > forwarded upstream
> > > to the provider. It will not handle downstream traffic. For downstream
> > > flows, tweaking BGP advertisements would be you best option.
> > >
> > > Barry
> > >
> > > > -----Original Message-----
> > > > From: owner-afnog at uol.co.ug [mailto:owner-afnog at uol.co.ug]On Behalf Of
> > > > Brian Longwe
> > > > Sent: Saturday, October 27, 2001 8:18 AM
> > > > To: afnog at afnog.org
> > > > Subject: Cisco access list - multihomed question
> > > >
> > > >
> > > > Hi,
> > > >
> > > > The scenario.
> > > >
> > > > - Two upstream circuits on the same border router
> > > > - I want to use one to carry (outgoing) traffic for certain
> > > > customer networks only
> > > > - I want to use the other as the standard default for all other
> > > > customer traffic
> > > >
> > > >
> > > >
> > > >    Upst #1 s0/0     [---------]
> > > > --------------------[         ]< Upst #1 should route traffic for
> > > > x.y.z.0/25
> > > >                     [         ]
> > > > --------------------[         ]
> > > >    Upst #2 s1/0:16  [---------]< Upst #2 should route traffic for
> > > > all others
> > > >
> > > > - Both upstream connections go to the same provider
> > > > - There is no BGP with upstream provider, only static
> > defaults (until now)
> > > >
> > > > Instinctively I want to define route-maps to block traffic for #2
> > > > from #1 and block traffic for #1 from #2 with a "next-hop"
> > > > statement to redirect in each route-map.
> > > >
> > > > Is this the right logic? Anyone with similar experience who
> > can give tips?
> > > >
> > > > Thanks,
> > > >
> > > > Brian Longwe
> > > >
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> 

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